Explaining the politicization of EU trade agreement negotiations over the past 30 years

Although the Transatlantic Trade and Investment Partnership with the USA and the Comprehensive Economic and Trade Agreement with Canada have elicited considerable domestic contestation in Europe, several other agreements have been negotiated into public and media indifference. What explains this difference? In this article, I put forward a number of arguments on the structural causes of the politicization of European Union (EU) trade policy over the past 30 years and test them against a newly collected dataset covering 19 preferential trade agreements. The qualitative comparative analysis suggests that the politicization of EU trade negotiations is determined by the co-occurrence of several, well-defined conditions. More specifically, it tells us that: (1) the Lisbon Treaty's reform of EU trade policymaking is the main driver of politicization, (2) the level of public support for the EU is of particular relevance when it comes to 'deep and comprehensive' agreements that touch on sensitive domestic issues, and that (3) high adjustment costs expected from trade liberalization can lead to the politicization of trade negotiations.